Sewing-machine.



L. G. COADE.

SEWING MACHINE.

APPLICATION FILED Nov. 27. |914.

Patented Maly 15, 191'?.

SEWING-MACHINE.

Specification of Letters Patent.

Patented May 15, 1917.

Application filed November 27, 1914. Serial No. 874,297.

To all whom t ymay cof/worm.'

Be it known that I, Lorru's GEORGE COADE,

subject of the King of Great Britain, residing at No. 448 Birchfie'ld road, Perry Barr, Birmingham, England, have invented certain new and useful improvements in Sewing-Machines, of which the following is a specification.

This invention rela-tes to improvements in sewing machines the object of which is to invoke as a mechanical relay a portion of the driving energy automatically to effect the stopping of the machine when the fabric is depleted or fed to the machine in a deviated position.

The invention will be described by reference to the accompanying drawings.

In these drawings Figure l is a front elevation showing the device for effecting the connection of the machine with the source of driving-energY and the means for effecting the disconnection therefrom and for stopping the machine. h

Fig. 2 is a sectional elevation at right angles to F ig. l and on a larger scale showing the means for automatically stopping the machine in the event of the supply of fabric for the sewing operation becoming depleted, which stopping device is adapted to come into operation also if and when the fabric is conveyed to the machine with its borders laterally deviate-d from the correct line of progress to an undue amount. l

A is the sewing-machine provided with a pulley a which is strap-driven from a source of power through the medium of a set of coaxially mounted pulleys, of which al is directly connected to a by a strap; al being frictionally driven by the side pressure thereon of a compound-pulley a? which is itself driven by another strap which embraces anv one of a set of grooves formed thereon. 'The frictional drive is transmitted by a leather ring a3 when a pin carried on the end of the arm at of a pivoted-lever is forced into Contact with o2. The arm at is formed integrally with an arm ai' to which force is applied to perform the clutching operation and also with an arm a6 on which is carried a brakespiece 0,7 which, on being forced into the groove of the pulley al, stops the sewing-machine.

Between the end of the arm a6 and a fixed bracket as is interposed a spring a9. Vhen, to effect the clutching operation, a downward pressure is applied to the arm ci', the spring a9 will be compressed and the brake released and when the pressure on the arm c5 is removed, energy stored in the spring @-9 will be rendered available to unclutch the pulleys al a2 and apply a braking force to the pulley al. i

rflhe above-described, well-known, clutching and braking contrivance is rendered available to serve the purpose of the present invention by the combination therewith of a tripping-device comprising a ,pivoted-lever B of which one arm is provided with a roller and its extremity so arranged that when the arm b is placed at right angles to the surface of the arm a5 the latter will be thrust into the clutching position, the -arm Z) being then in such a state of instable equilibrium that a. small displacement thereof will release the before-mentioned spring a9 and Venable it to operate as a mechanical-relay to disconnect yand arrest the Amotion of the sewing-machine. The lever B is shown provided with two other arms viz. -a loaded arm b1 and another arm b2, which is, with permissible lost-motion, connected to a rod Z whereby the compound-lever B will be required to undergo a displacement as a consequence of imperfection in the supply of fabric to the sewing-machine.

The fabric H is conducted over a pair of parallel bars 71,1 fil, the extremities of which are carried on levers h2, keyed to a shaft 7a3, to which other levers are also keyed as will be presently described. Resting on one or each of the two borders ofthe portion of the fabric lying between the bars hl h1 is a feeler It, vhich by a link ht supports a partially counterbalanced lever h5, which is pivotally mounted on. the extremity of a lever ,71,6 which also is keyed to the shaft 71,3. The lever r" constitutes, for the present purpose, the passive engaging-element of this invention, and to enable it to perform its desired function it is, at its free extremity, formed with a claw 7i? adapted to engage with a continuously rotating claw its constituting the active engaging-element. The claw LS is keyed on a shaft k12 continuously rotated by a pulley 7tlg and belt hlt.

lf, on account of the depletion of the fabric or the lateral displacement of its border to such a degree that either of the feelers fail to receive the support normally due to the pressure of the fabric progressing between it andthe bars h1 h1, the claw 7L? of the lever h5 will drop and inter-pose itself in the path of the claw hs, whereby a force will be exerted angularly to displace the shaft h3. To the shaft h3 is keyed a lever kf and this by a link h1" and a bell-crank hu, is interconnected with the before-mentioned rod cl of Fig. l whereby, as previously described, the machine will be stopped.

rI`he angular displacement of the shaft hs will cause the several components of the above-described mechanism to undergo a change of position as indicated in dotted lines.

I claim:

1. In a sewing-machine, a clutch driving said machine, tripping means for retaining` said clutch in engagement with said machine, supports beneath the fabric led through said machine, a lever connected to said tripping means, a claw on said lever, a feeler resting on the border of said fabric between said supports and connected to said claw lever and a moving claw adjacent to said claw.

2. In a sewing-machine, a clutch driving said machine, tripping means for retaining said clutch in engagement with said machine, supports beneath the fabric led through said machine, a lever connected to said tripping means, a claw on said lever, a feeler resting on the border of said fabric between said supports and connected to said claw lever anda rotating claw adjacent to said claw.

3. In a sewing-machine, a clutch driving said machine, tripping means for retaining said clutch in engagement with said machine, pivoted supports beneath the fabric led through said machine, a lever connected to said tripping means and to said pivoted supports, a claw on said lever, a feeler resting on the border of said fabric between said supports and connected to said claw lever and a rotating claw adjacent to said claw.

4. In a sewing-machine, a clutch driving said machine, tripping means for retaining said clutch in engagement with said machine, a shaft connected to said tripping means, levers secured to said shaft, bars eX- tending between said levers beneath the fabric led through said machine, another lever secured to said shaft, a lever pivoted to said last-mentioned lever, a feeler resting on the border of said fabric between said bars and connected to said pivoted lever, a claw on said pivoted lever and a rotating claw adjacent to said claw.

In testimony whereof I affix my signature in presence of two witnesses.

LOFTUS GEORGE COADE.

Witnesses:

FRANK SCOTT POOLE, ERNEs'r I-IAnKER.

Copies of this patent may be obtained for five cents each,.by addressing the Commissioner of Patents, Washington, D. G. 

